firmware: arm_sdei: add SDEI_EVENT_SIGNAL support

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Add sdei_event_signal(), a thin wrapper over the SDEI_EVENT_SIGNAL call
(DEN0054) that makes the software-signalled event (event 0) pending on a
target PE -- delivered NMI-like even when that PE has interrupts masked.
It takes no locks, so it is safe to call from NMI / crash context.

Signed-off-by: Kiryl Shutsemau (Meta) <kas@kernel.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Yin Fengwei <fengwei_yin@linux.alibaba.com>
Signed-off-by: Will Deacon <will@kernel.org>

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Kiryl Shutsemau (Meta) 2026-06-29 16:07:16 +01:00 • committed by Will Deacon

parent 5686f2bed0

commit 9141eda9ee

3 changed files with 19 additions and 0 deletions

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12

drivers/firmware/arm_sdei.c

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6

include/linux/arm_sdei.h

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1

include/uapi/linux/arm_sdei.h

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